Install multiple version on the same server (just for test)

for test purpose, I would like to install on the same server serverA two different Elasticsearch version.
Currently, I have version 6.8.9 and I want a second instance with version 7.7.

My first instance has been installed with the rpm method. What should I use to install the second instance avoiding overwrite of folders (/etc/elasticsearch and /usr/share/elasticsearch)?

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